Paper article and method of making the same



Patented MayI O, 1932 r n v i i unrrsso stares; PATENT OFFICE- i i a i cLArr,or nAnvnns Mhsseonusnmis. I i 'v if i I MAK NMHE i. in Drawing. Ap' ucahdnfaied' mam, IQZQESeIia I No. 123,0235'EenewedNovember 9,1931. i

In my application, Serial ;No."94e,329, filed and forty; parts ofasbestosj fiber are placed March 12, 19%,"1 have described a grease in the beater engine, together with sufiicient proof, water-resistantand fireproof paper, Water to ensure circulation of the mass. and a method of. making the same. In ac.- The mass is then thoroughlymixedby oper- 5 cordance'with the method'therein described, ation of the engineforabouttwentyminutes, s5 asbestos and cellulose fibers are intermixed in during which time about 1 to: of thebeater engine. Lime or equivalent filling lime, based on thed-ry weightof fiber,is prefmaterial is preferably added and disseminaterably added and disseminated throughout ed throughout the fibers. The furnish is the fibers. Thefurnish is then'run'ofi' on a 10 then run ofi' on a papermaking machine and cylinder 'or F ouridrinier" machine, and the 60" formed into a paper web, which is then dried. paper web is dried. The dried web is now The asbestos-cellulose paper web is then satsaturated with sodium silicate, as: by pasurated with a sodium silicate solution. The sage through abath of sodium silicate cornsodium silicate forms with the asbestos posed, for example, of equal" parts by weight;

, fibers and lime throughout the paper a plase of a-solution ofs odium silicate (60 B'aume') or;

tic composition, which sets or hardens perand water, Any excess sodium silicate m y manently to a rigid condition and imparts be removed by passing the web through the desired characteristics to the paper. squeeze rolls. Thcsodiu-m silicate appe rs; While setting or hardening istaking place, to destroy the" fibrous characteristics oft-he. the paper acquires a temper or consistency asbestos, producing a plastic composition in permitting it to be formed ormoulded into throughout thejweb, whichbe'haves in some articles. For instance, the paper may be respects like Portland cementas it becomes. bent and moulded without being cracked or set. I i V V broken, and in this respect behaves like duc- Thewebimmediately aftertreatmenii with r tile sheet metal,such as sheet-tin, zinc,and sodiumsilicatedoes not"permitflofsuccess- 7'5 the like. The paper while in temper is ad fu'l moulding, but must be reduced to the mirably adapted for manufacture into plates, proper temper. This is accomplished byzdrybaking utensils and like articles, by moulding ing the web to a water contentof about 20% suitably cut blanks to shape and allowing to -3'0%,at which stage the webis intemperthe shaped article to set or harden. Such or condition for moulding. Blanks are eat-L 30 articles are light, rigid, and permanently set. from the tempered weband are i moulded Articles made by the method outlined posinto articles under a p'ressune'v of about*5.00 sess a more or less rough or unfinished surpounds per squareginch and atemperature face and a gray color, to which objection is of aboutl60 zto L F,,' Setting of theweb sometimes made, especially when intended takes place 'immediately,*resu lting in an arfor use in connection with food. I have now ticle having a firm, hard, smooth surface" found that if moulding of such articles takes The article may be removedfrom the mould place under pressure and at an elevated temwithout experiencing difiiculty due tostic-kperature, a firm, hard, smooth surface preing or other cause.:; Preferably, the-temperasenting. a finished appearance results; I ture ,of noulding should not-exceed 200 E,

have further found that a finely divided, since bl'istering is'fl-ikelyto'take place at white, inorganic filler such as clay or silex, higher temperatures. 1 1

if sprinkled on to the surface of thetem- 'Where a plate or like article resembling pered paper prior to moulding, a white surwhite crockery is desired, agwhite,inorganic, 4 face resembling White crockery is produced finelydividedfilling'materialsuchgas china 9 by such heatand pressure treatment. clay or silexis sprinkled onto the surface p A procedure which may be practised in of -the 'webs after fthesodium,si1icate treat= producing articlesfsuch as herein desired ment or prior to mould-ingn A mi-zrture of may be substantially as follows. Sixty parts about 7 5*;parts -of' clay and. 25 parts silex :is

of cellulose fiber, e. g., bleached sulphite fiber, satisfactor ly for suchpurposeu Mou'lding:=un.-:. 190': Y i

tion are suitable foruse at omitted der pressure, at an elevated temperature results in a combination between the clay, sileX and sodium silicate, to produce a white, hard smooth surface resembling white crockery. If desired, a colored surface may be produced by using a colored clay as the surface filling material. I

Articles such as herein formed may be made from a web having a thickness of 10 to 15 points, and hence are very light, being about 1/20 the weight of usual crockery. Plates formed by the method of this inven- V picnics and festivals and are sufficiently cheap to bediscarded after use. Y

. It is obvious that the components of the furnish for forming the paper web may be varied in proportion. In the example given, other proportions of asbestos and cellulose fiber may be used, but in general approximately equal parts of the two fibers are most satisfactory. The proportion of lime in the furnish may also be varied or itmay be substituted by such material as Portland cement or magnesium oxide. "In fact, the lime may be dispensed with, although for optimum results lime or equivalent material should be employed. The use of asbestos fiber may be i if the percentage of lime or equivalent material is raised to a sufficiently high figure, say 20%, but inasmuch as this expedient leads to inferior results, asbestos fiber is preferably employed; v r Having thus described the nature of this invention and a way of making and using the same, although without attempting to set forth all the formsin which itmay be made or all the modes of its use. i

WhatI claim is: V i

-1. A method which comprisessaturating'an asbestos cellulose paper with a solution of sodium silicate, dryi-ngthe paper to a water content of about 20% to 30%, and moulding the web under pressure at an elevated temperature into an article of the desired shape.

2. A method which comprises forming a paper web comprising a material capable of reacting with a reagent to produce a hardening compound, treating the web with the reagent,sprinkling afinely divided filler onto the surface of the web, and moulding the web under pressure at an elevated temperature into an article of the desired shape.

3. A method which comprises treating an asbestos cellulose paper with a solution of sodium silicate, sprinkling a finely :divided, in organic filler capable of reacting with the sodiumsilicate onto the surface of the paper, and moulding the; paper under pressure at 7 an elevated temperature intoan article of the q desired shape.

a 4. A method asbestosscellulose fiber web filled with lime with a solution of sodiumsilicate, sprinkling finely divided clay ontothe surface ofithe .material'p'ermea'ted with a hardening compos tion comprising asbestosand sodium silicate and having a smooth, -hard, white surface filled with the reaction product of clay and sodium silicate.

7. An article comprising interfelted fibrous material permeated sition comprising asbestos and sodium silicate and having a smooth, hard, ,white surface filled with the reaction product of clay, silex and sodium silicate. Y

In testimony whereof I have aflixed my ALBERT neLArrQ v I i signature.

with a hardening compo which comprises treating an 

